Crank Toepler-Holtz (there should be no sparking between the terminals). Pith balls should fly back and forth between top and bottom plate of hailstorm chamber.

Discharge Toepler-Holtz generator--you will likely see a fat spark between the two terminals as you do this. Do not put your hands near the terminals before you discharge them--the spark from the Toepler-Holtz can be painful.